Oh No!! So I was stupid and listened to someone who said get a couple of bottom feeders, catfish or sharks, to clean up the gravel. Went to Pet store and they recommended what I think is a Columbian Shark, but I got TWO!! It just happened to be the only fish without a tag on their aquarium to read about. Took the advice of employee & I purchased them, get home and research (backwards, I know) now I'm reading they get big and ONE alone requires a 55g?? I have TWO! Plus 2 tiger barbs, 2 rosy barbs and a rubber lip pleco in a 36g:'(...will I kill them? Also having lots of hard water problems and high PH that I need help with...maybe I should post that on another thread though. Thanks for any advice.